someone had told the police that thieves would try to steal the diamonds.这句话中的had是怎么回事?

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• Someone told the police that thieves would try to steal the diamonds.这里的 steal 为什么是原型为什么  thieves 前面没有the原文在Someone 后面有 had 请问，Someone told the police that thieves would try to steal the diamonds.与 Someone had told the police that thieves would try to steal the diamonds.意思都一样吗。这两种说法在语法上是否都正确。
• someone had told the police that thieves would try to steal the diamonds.这句话中的had是怎么回事?不是应该用has吗?还是另有原因?
• someone had told the police that thieves would try to steal the diamonds.这句话中的had是怎么回事?
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